I think this is a good example of how if your desired username/domain is already taken, there’s usually a clever tweak you can do to get a similar one that works. In the case of Steam they went with “steampowered.com” instead.

It makes me wonder why so many people go with like “firstname225” rather than spending a couple of minutes coming up with something little bit less silly-looking. In fact there was a funny thing for a while where a user iterated through all the @kevin(number) Twitter users every Friday: https://www.gawker.com/5895578/weird-internets-how-one-man-i...